The main reason I don't post these is that I'm awful at keeping track of exactly how much of what I put in, and baking recipes usually require exact numbers of cups and spoonfuls that need to go in. So take my numbers with a pinch of salt and play around with them as required.
For 6 muffins I used: a cup of flour, a small spoon of baking powder, 1/4 cup of sugar, a pinch of ground cinnamon, close to half a cup of milk, one egg and some butter. Mix these ingredients properly in a bowl, and then fill muffin cups about 2/3s full. I fill mine just a little more than half because I don't like giant muffins that mushroom out the top. Throw a few blueberries in.
For the crumble: combine 2 parts flour to one part sugar with a pinch of cinnamon. Throw in cold butter and mix with your hand to create a crumble. Sprinkle some on top of each muffin mixture.
BAKE till you put in a toothpick and it comes out clean.
